Enlightenment

From Grokdoc

A pretty window manager, but thats about it, bring your own filemanager.

The scrolling screens is really cool, might make it more difficult to "get lost" in them, assuming you're comfortable with the pointer on left/right edge changes screens functionality (or the control menu to turn that off).

The screen managing windowy bits are really cool. KDE's version is really pale in comparison, probably most other window managers too.